It is apparently common for Nigerian immigrants to the U.S. to have two weddings when they get married: one here in the States, either in American traditional style or in hybridized cultural fashion, and one back in Nigeria, following (often pre-colonial) traditions of their tribes. 

For example, the Nigerian (Igbo) immigrant parents of Chika, a Bay Area native, had a typical “white wedding” in the U.S., and another in Nigeria during which his mom and dad “walked through his [dad’s] neighborhood with everyone playing music and dancing on the way to the ceremony.”

This practice makes complete sense in the context of ceremonial rites of passage like weddings being ritualized and performed publicly in order for transitions and new identities to be communicated to and recognized by community members. Being that Nigerian immigrants often have at least two international communities, each with their own cultural norms and social categories, it can be affirming of new relationships developing on the intersection of both to have two weddings.